Reaching Level 25The day after you first enter the Skull Cavern, you will receive a letter from Mr Qi. It challenges you to reach level 25, with a 10,000g reward.
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Floor 100 of the Skull Cavern is guaranteed to contain a treasure chest. The only exception is during the run where the player completes the secret.
Staircases work just like the game-supplied down-ladders. Each one works only for one use. Leaving the mine or returning to a higher floor will result in the staircase being permanently gone. In addition, once a staircase has been placed, it cannot be picked up again, even if it has not been used.